Here are a few tidbits to get you started. Stanford's admissions FAQ explicitly states (emphasis mine)
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We recognize special circumstances, and we pay close attention to the unique educational contexts and life experiences of students from low-income families and nontraditional backgrounds
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That's from the question on affirmative action, mind you, suggesting that socioeconomic status is more important than race. QuestBridge also says
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QuestBridge works with 30 partner colleges that actively seek students who have overcome economic obstacles to achieve academic success.
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Is that explicit enough?
If you or anyone else is interested in learning more about socioeconomic issues in higher education, I highly recommend reading the full Carnevale and Rose study. It's very illuminating.
http://tcf.org/publications/pdfs/pb2...evale_rose.pdf 
